Analysis on Mechanical Behavior of PC Continuous Beam Steel Box Arch Rib Composite Bridge
To explore the load distribution and local mechanical performance of a prestressed continuous beam-tied arch bridge,finite element analysis of a specific bridge is carried out.The bridge model is constructed using the finite element software MIDAS/civil,and the mechanical behavior of the arch rib,main longitudinal beam,tie bar,and suspender components during both the construction and operation phases are analyzed.The results indicate that the mechanical properties of the main components of the prestressed continuous beam tied arch bridge meet the relevant specifications during the construction stage and the ultimate bearing capacity state.In the normal serviceability limit state,all components except for the tension area of the main beam meet the stress requirements.Subsequently,the triangular area at the connection of the V-shaped pier and the main beam is analyzed using the finite element software ANSYS.Based on the analysis results,it is recommended to reinforce the tensile stress web of the box girder with reinforcement mesh to prevent cracking.Moreover,there is an occurrence of excessive tensile stress at the inner corner of the joint section between the mid-span pier and the beam,thus the implementation of corresponding strengthening measures are recommended in this area.
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